Threshold Limit Value (TLV)

From OpenToxipedia

Jump to: navigation, search
Term Threshold Limit Value (TLV)
Description Recommended guidelines for occupational exposure to airborne contaminants published by the American Conference of Governmental Industrial Hygienists (ACGIH).
Definition Threshold Limit Value (TLV)

Recommended guidelines for occupational exposure to airborne contaminants published by the American Conference of Governmental Industrial Hygienists (ACGIH). TLVs represent the average concentration in mg/m 3 for an 8-hour workday and a 40-hour work week to which nearly all workers may be repeatedly exposed, day after day, without adverse effect. Refers to airborne concentrations of substances and represents conditions under which it is believed that nearly all workers are protected while repeatedly exposed for an 8-hr day, 5 days a week (expressed as parts per million (ppm) for gases and vapors and as milligrams per cubic meter (mg/m 3 ) for fumes, mists, and dusts).  The concentration of an airborne substance to which an average person can be repeatedly exposed without adverse effects. TLVs may be expressed in three ways: (1) TLV-TWA--Time weighted average, based on an allowable exposure averaged over a normal 8-hour workday or 40-hour work- week; (2) TLV-STEL--Short-term exposure limit or maximum concentration for a brief specified period of time, depending on a specific chemical (TWA must still be met); and (3) TLV-C--Ceiling Exposure Limit or maximum exposure concentration not to be exceeded under any circumstances. (TWA must still be met.)

References http://www.epa.gov/iris/help_gloss.htm#s

http://rais.ornl.gov/home/glossary.html#L

http://www.epa.gov/OCEPAterms/tterms.html

http://sra.org/resources_glossary_s-u.php  

Comments
Additional Information

TermTerm